CN109217450B - Redundant power supply system capable of prolonging maintenance time after power failure - Google Patents

Redundant power supply system capable of prolonging maintenance time after power failure Download PDF

Info

Publication number
CN109217450B
CN109217450B CN201710538784.7A CN201710538784A CN109217450B CN 109217450 B CN109217450 B CN 109217450B CN 201710538784 A CN201710538784 A CN 201710538784A CN 109217450 B CN109217450 B CN 109217450B
Authority
CN
China
Prior art keywords
power supply
power
terminal
inductor
gate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201710538784.7A
Other languages
Chinese (zh)
Other versions
CN109217450A (en
Inventor
邱瑞阳
叶政彦
卓建廷
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Acbel Polytech Inc
Original Assignee
Acbel Polytech Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Acbel Polytech Inc filed Critical Acbel Polytech Inc
Priority to CN201710538784.7A priority Critical patent/CN109217450B/en
Publication of CN109217450A publication Critical patent/CN109217450A/en
Application granted granted Critical
Publication of CN109217450B publication Critical patent/CN109217450B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/10—Parallel operation of dc sources
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/10—Parallel operation of dc sources
    • H02J1/108—Parallel operation of dc sources using diodes blocking reverse current flow

Abstract

A redundant power supply system capable of prolonging the maintenance time after power failure comprises a plurality of power supplies and a plurality of maintenance control circuits, wherein the power supplies are connected in parallel to connect an input capacitor of a load system, an OR gate anti-reflux element is connected between each power supply and the input capacitor, the maintenance control circuits are respectively and correspondingly connected with the direct current output sides of the power supplies, each maintenance control circuit comprises an inductor, an electronic switch and a controller, the inductor is connected in series with the OR gate anti-reflux element, the electronic switch is connected between the series node of the inductor and the OR gate anti-reflux element and the direct current output of each power supply, and the controller controls the electronic switch to be connected or not according to the size of the direct current power output by the direct current output side to achieve the purpose of prolonging the maintenance time after power failure.

Description

Redundant power supply system capable of prolonging maintenance time after power failure
Technical Field
The present invention relates to a redundant power supply system, and more particularly to a redundant power supply system capable of prolonging the retention time after power failure.
Background
Referring to fig. 7, a circuit architecture diagram of a typical redundant power supply system is disclosed, which includes a plurality of power supplies 30, and as is well known, each of the power supplies 30 mainly includes an ac/dc power conversion circuit having an ac input side for receiving an ac power from a utility power, a power factor correction circuit, and a dc/dc power conversion circuit having a dc output side provided with an output capacitor C1.
Through the cooperation of the AC/DC power conversion circuit, the power factor correction circuit and the DC/DC power conversion circuit, the AC power is subjected to DC conversion and power factor correction, so that a DC power Vo is output at the DC output side. The dc output sides of the power supplies 30 are connected in parallel to each other and externally connected to an input side of a load system 40. An or diode (ORing diode)50 is connected between the dc output side of each power supply 30 and the load system 40, an anode terminal of the ORing diode 50 is connected to the dc output side of each power supply 30, and a cathode terminal of the ORing diode is connected to the load system 40.
The typical redundant power supply system is that the plurality of power supplies 30 collectively output a dc power Vo, which is supplied to the input side of the load system 40 through a forward biased or gated reverse blocking diode 50 while storing energy in an input capacitor C2 on the input side of the load system 40. On the premise that the ac input sides of the power supplies can normally receive ac power, when any power supply 30 fails to output dc power Vo, the other power supplies 30 can continuously supply power to the load system 40, thereby achieving the effect of no power failure. By the arrangement of the or-gate anti-reflux diode 50, the failed power supply 30 can be isolated from other normal power supplies 30, and the fault current can be prevented from entering the dc output side of each power supply 30.
Alternatively, the or gate reverse flow prevention diode 50 may be replaced by an or gate reverse flow prevention transistor (ORing MOS) (not shown), the drain terminal and the source terminal of the or gate reverse flow prevention transistor are respectively connected to the dc output side of each power supply 30 and the load system 40, a body diode is disposed between the drain terminal and the source terminal, a controller is electrically connected to a control terminal, the drain terminal and the source terminal of the or gate reverse flow prevention transistor, and when the controller determines that the body diode is reverse biased (the source terminal voltage is greater than the drain terminal voltage), the controller controls the or gate reverse flow prevention transistor to be in an open circuit state, so as to isolate the failed power supply 30 from other normal power supplies 30 and prevent the fault current from entering the dc output side of each power supply 30.
When the typical redundant power supply system suddenly stops outputting the dc power, such as a sudden shutdown or a sudden power jump of the ac power, the load system 40 performs an emergency processing procedure (e.g., data backup or shutdown …, etc.) because it does not receive the dc power Vo, and the input capacitor C2 at the input side of the load system 40 releases the stored energy. With the sustained release of stored energy, the terminal voltage of the input capacitor C2 gradually decreases, and when the load system 40 detects that the terminal voltage of the input capacitor C2 is below a threshold voltage, the load system 40 is directly turned off. The duration from when the load system 40 does not receive the dc power Vo until the terminal voltage of the input capacitor C2 is lower than the threshold voltage is referred to as a sustain time. Obviously, when the load system 40 is shut down, if the emergency processing procedure is not completed, the load system 40 may be shut down abnormally, resulting in bad results (e.g., data loss).
Typical improvements may choose to have a larger output capacitor C1 in each of the power supplies 30, allowing the input capacitor C2 of the load system 40 to draw energy from the output capacitor C1 after power down, delaying the discharge of the input capacitor C2 to extend the hold time. However, the use of the large-capacitance output capacitor C1 for each power supply 30 is not only more costly and bulky, but also causes inconvenience in the overall mechanical design of the typical redundant power supply system, and the use of the large-capacitance output capacitor C1 only for the limited effect of temporarily prolonging the holding time is not cost effective.
Disclosure of Invention
Accordingly, the primary objective of the present invention is to provide a redundant power supply system capable of prolonging the retention time after power-off, which is based on the circuit architecture of the typical redundant power supply system and can effectively prolong the retention time without using an output capacitor with larger capacity.
The invention can prolong the redundant power supply system of the holding time after the power failure, for connecting an input capacitor of a load system, the redundant power supply system includes:
a plurality of power supplies which are connected in parallel with each other and are used for being connected with the input capacitor, at least one OR gate reverse flow prevention element is connected between a direct current output side of each power supply and the input capacitor, and the direct current output side is provided with an output capacitor;
a plurality of sustain control circuits respectively connected between the dc output sides of the plurality of power supplies and the load system, each sustain control circuit comprising:
at least one inductor connected in series with the at least one OR gate anti-reflux element;
at least one electronic switch connected between the series node of the inductor and the OR gate anti-reflux element and the DC output side of each power supply; and
and the controller is connected with the direct current output side of each power supply and a control end of the at least one electronic switch so as to judge whether the direct current power output by the direct current output side is lower than a lower limit value and control whether the at least one electronic switch is conducted or not.
According to the invention, when the plurality of power supplies operate normally, the controller can judge that the output of the direct current power supply exists in each group of power supply and maintaining control circuit, the controller controls the electronic switch to be in an open circuit state, and at the moment, the direct current power supply output by the power supply can be transmitted to the load system. When the power supplies stop operating suddenly, the controller can judge that there is no output of the direct current power supply, the controller controls the electronic switch to be in an intermittent conduction state, energy is released from the output capacitor and the inductor of each power supply to the input capacitor of the load system, so that the terminal voltage of the input capacitor is maintained to be decreased for a period of time or decreased at a slower speed, and the maintenance time is further prolonged, for example, the maintenance time provided by the invention can be more than 1.5 times of the maintenance time provided by a typical redundant power supply system, and the load system has more sufficient time to complete the emergency processing procedure after power failure.
On the other hand, compared with a capacitor with large capacity, the maintaining and controlling circuit only comprises electronic parts such as a controller, an inductor, a diode or a transistor, the cost of the maintaining and controlling circuit is lower, the size is smaller, the inconvenience of the design of the whole mechanism of the system is avoided, and the problems derived from the adoption of the capacitor with large capacity in the prior art are overcome.
The invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited thereto.
Drawings
FIG. 1: the invention can prolong the circuit structure diagram of the redundant power supply system of the maintenance time after power failure;
FIG. 2: the circuit schematic diagram (one) of one embodiment of the power supply and the corresponding one of the maintenance control circuits of the present invention;
FIG. 3: the circuit diagram of one embodiment of the power supply and the corresponding keeper control circuit of the present invention is shown in the second embodiment;
FIG. 4: the circuit diagram (III) of one embodiment of the power supply and the corresponding one of the maintenance control circuits of the present invention;
FIG. 5: the circuit diagram of one embodiment of the power supply and the corresponding one of the maintenance control circuits of the present invention Is (IV);
FIG. 6: an embodiment of a circuit diagram of one power supply and a corresponding keeper control circuit according to the present invention is shown (V);
FIG. 7: the circuit architecture of a typical redundant power supply system is shown.
Detailed Description
The invention will be described in detail with reference to the following drawings, which are provided for illustration purposes and the like:
referring to fig. 1, the redundant power supply system 10 capable of prolonging the retention time after power failure according to the present invention is connected to the input capacitor C of the load system LSYSThe redundant power supply system 10 outputs a DC power supply VDCTo the load system L. When the load system L detects the input capacitor CSYSIs below a threshold voltage, the load system L is turned off directly. Wherein the DC power V is not received from the load system LDCTo the input capacitor CSYSThe duration of time that the terminal voltage of (a) is lower than the threshold voltage is called a sustain time.
The redundant power supply system 10 includes a plurality of power supplies 11, at least one or gate (ORing) backflow prevention element 12 correspondingly connected to each of the power supplies 11, and a plurality of maintenance control circuits 13. The embodiment shown in fig. 1 is only illustrated by two power supplies 11, but not limited thereto. Alternatively, the present invention may also be composed of the power supply 11, or gate (ORing) backflow prevention element 12 and the holding control circuit 13.
As shown in FIG. 1, the power supplies 11 are connected in parallel to each other for connecting the input capacitor C of the load system LSYSA many-to-one (i.e., a plurality of power supplies 11 to one load system L) connection structure is formed. Each of the power supplies 11 has a dc output side, and the dc output side of each of the power supplies 11 is connected to the load system L through the or gate backflow prevention element 12. For example, each of the power supplies 11 mainly includes an ac/dc power conversion circuit having an ac input side receiving an ac power from a commercial power, a power factor correction circuit having a dc output side outputting a converted dc power V, and a dc/dc power conversion circuit having a dc output side receiving an ac power from a commercial powerDCA DC power supply V outputted from each of the power supplies 11DCIs supplied to the load system L through the or gate backflow prevention element 12. The plurality of sustain control circuits 13 are respectively connected to the dc output sides of the plurality of power supplies 11, so as to form a one-to-one (i.e., one power supply 11 to one sustain control circuit 13) connection structure.
The multiple keeper control circuits 13 are respectively and correspondingly connected between the dc output sides of the multiple power supplies 11 and the load system L, please refer to the embodiments shown in fig. 2 to 6, which only take any one power supply 11 of the multiple power supplies 11 and a corresponding keeper control circuit 13 as an example for description, wherein the dc output side of each power supply 11 has a power end 111 and a ground end 112, and an output capacitor C is disposed between the power end 111 and the ground end 112DC. Each sustain control circuit 13 comprises at least one inductor 131, at least one electronic switch 132 and a controller 133.
In the first embodiment shown in fig. 2, each of the sustain control circuits 13 includes an inductor 131, an electronic switch 132 and a controller 133, and the dc output side of each of the power supplies 11 is connected to an or gate backflow prevention element 12. The inductor 131 is connected in series with the or gate anti-reflux element 12, wherein one end of the inductor 131 is connected to the power end 111,the OR gate reverse-flow preventing element 12 is connected with the input capacitor C of the load system LSYSThe electronic switch 132 is connected between the ground terminal 112 and the serial node n of the inductor 131 and the or gate reverse current prevention element 12. The electronic switch 132 may be a transistor having a first terminal, a second terminal and a control terminal, for example, the first terminal may be a Drain terminal (Drain), the second terminal may be a Source terminal (Source), the control terminal may be a Gate terminal (Gate), the first terminal is connected to the series node n, and the second terminal is connected to the ground terminal 112; the or gate reverse-flow preventing element 12 may be an or diode (ORing diode), an anode end of which is connected to the other end of the inductor 131, and a cathode end of which is connected to the input capacitor C of the load system LSYS. The controller 133 is connected to the power supply 11 and the control terminal of the electronic switch 132 to determine whether the dc output side outputs the dc power VDCAnd controls the electronic switch 132 to be turned on or off.
For example, as shown in FIG. 2, the controller 133 can be connected to the power source end 111 to detect the DC power VDCWhen the controller 133 determines that the DC power supply V is turned onDCIf the value is greater than or equal to a lower limit value, judging that a direct current power supply V existsDCAn output of (d); otherwise, when the controller 133 determines that the dc power V is suppliedDCIf the value is lower than the lower limit value, it is judged that no DC power supply V existsDCTo output of (c). Alternatively, the controller 133 may be further connected to the ac input side of the power supply 11 through a photo-coupler 134(photo-coupler) to directly detect whether the ac power V is availableACIf there is no AC power supply VACOf course without said dc supply VDCTo output of (c).
Referring to fig. 1 and 2, when all the power supplies 11 are operating normally, the power supplies 11 output dc power V simultaneouslyDCTo be supplied to the load system L. In each set of the power supply 11 and the hold control circuit 13, when the controller 133 determines that there is a DC power VDCThe controller 133 controls the electronic switch 132 to be in an open state, and the dc power V is supplied at this timeDCThe inductor 131 and the OR gate reverse-flow preventing element 12 reach the load system L, the output capacitor C of each power supply 11DCAnd an input capacitor C of the load system LSYSAccording to the DC power supply VDCWhile storing energy, the inductor 131 can filter the DC power supply VDCSwitching ripple (switching ripple) and high frequency noise.
When all the power supplies 11 stop operating suddenly, e.g. shut down suddenly or AC power supply VACSuddenly jumping, all power supplies 11 do not output DC power VDCThe output capacitor CDCThe stored energy is released to cause the terminal voltage to decrease, so that in each set of power supply 11 and maintenance control circuit 13, the controller 133 determines the DC power VDCWhen the voltage is lower than the lower limit, the controller 133 controls the electronic switch 132 to be in an intermittent conducting state, for example, the controller 133 may output a Pulse Width Modulation (PWM) signal to the control terminal of the electronic switch 132. Referring to fig. 2, the output capacitor C of each power supply 11DCThe inductor 131, the or gate reverse-flow prevention element 12, the electronic switch 132 and the controller 133 form a Boost converter (Boost converter), the operation principle of which is well known and will not be described in detail herein.
Therefore, compared with the typical redundant power supply system without the boost circuit, the present invention is characterized in that when all the power supplies 11 stop outputting the DC power VDCWhile the output capacitor CDCReleasing the stored energy to the input capacitor C of the load system L by the voltage boost circuitSYSLet the input capacitor CSYSReceives the boosted voltage, so that the input capacitor CSYSThe terminal voltage is decreased after being maintained for a period of time, or decreased at a slower speed, so as to prolong the maintaining time, so that the load system L has more sufficient maintaining time to complete the emergency processing procedure after power failure.
Referring to the second embodiment shown in fig. 3, in each set of power supply 11 and maintaining control circuit 13, each power supply 11 passes through a plurality of or gate backflow prevention elementsThe device 12 is connected to the load system L, and the sustain control circuit 13 includes a plurality of inductors 131, a plurality of electronic switches 132, and a controller 133. The plurality of inductors 131 are respectively connected in series to the plurality of or gate backflow prevention elements 12, and the plurality of electronic switches 132 are respectively connected between a series node n of the plurality of inductors 131 and the plurality of or gate backflow prevention elements and the dc output side of each of the power supplies 11. Specifically, one end of each inductor 131 is connected to the power source terminal 111, and each or-gate reverse-flow preventing element 12 is connected to the input capacitor C of the load system LSYSEach of the electronic switches 132 is connected between the ground terminal 112 and the serial node n of each of the inductors 131 and each of the or gate backflow prevention devices 12, and the controller 133 is connected to the control terminals of the electronic switches 132. Therefore, the output capacitor C of each power supply 11DCThe plurality of or gate backflow prevention elements 12, the plurality of inductors 131, the plurality of electronic switches 132, and the controller 133 may form a plurality of boost circuits after the ac power is turned off.
It should be noted that, in the second embodiment shown in fig. 3, when the controller 133 performs the step-up operation, the controller 133 may adopt a phase delay method to equally distribute the conduction phase difference of the electronic switches 132, for example, when there are m electronic switches 132, the phase difference of every two electronic switches 132 is 360 °/m, thereby the output capacitor C can be made to be the output capacitor CDCThe released current is equally distributed in each voltage boosting circuit to achieve the effect of current sharing, so that the current borne by the inductor 131 and the or gate backflow prevention element 12 in each voltage boosting circuit is smaller, and the design of the inductor 131 is simpler.
The or gate backflow prevention element 12 of the first and second embodiments is an ORing diode (ORing diode), and another embodiment of the or gate backflow prevention element 12 may be a transistor element (ORing MOS). For example, referring to fig. 4, the or Gate backflow prevention element 12 has a first terminal, a second terminal and a control terminal, the first terminal and the second terminal can be a Drain terminal (Drain) or a Source terminal (Source), respectively, the control terminal can be a Gate terminal (Gate), the control terminal is connected to an output terminal of the controller 133, the first terminal and the second terminal of the Gate backflow prevention element 12 are connected to the output terminal of the controller 133, respectivelyConnecting two input terminals of the controller 133 for the controller 133 to detect the terminal voltage Va of the first terminal and the terminal voltage Vb of the second terminal; a body diode (body diode)121 is disposed between the first end and the second end, an anode end of the body diode 121 faces the dc output side of each power supply 11, and a cathode end faces the load system L. Specifically, referring to the embodiment shown in fig. 4, the anode terminal of the body diode 121 is connected to the inductor 131, and the cathode terminal thereof is connected to the input capacitor C of the load system LSYS。
Referring to fig. 4, when the controller 133 determines that there is a dc power VDCThe controller 133 controls the electronic switch 132 to be in an open state and controls the or gate anti-reflux element 12 to be in a conducting state to let the dc power supply VDCTo the load system L. Otherwise, when the controller 133 determines that there is no DC power supply VDCThe controller 133 controls the electronic switch 132 and the or gate backflow preventing element 12 to be in a synchronous intermittent conduction state so as to make the output capacitor C of the power supply 11 outputDCThe inductor 131, the body diode 121, the electronic switch 132 and the controller 133 form a Boost converter (Boost converter). On the other hand, when the controller 133 determines that the body diode 121 is under reverse bias (i.e., Va)>Vb) representing the possibility of a fault current passing through, the controller 133 immediately controls the or gate reverse-flow prevention element 12 to be in an open state to isolate the power supply 11 from the fault current entering the dc input side of the power supply 11. In this embodiment, compared with the technology of the or gate anti-backflow transistor and the controller in the prior art, only the electronic components such as the inductor 131 and the electronic switch 132 are further provided in the present embodiment in terms of hardware, so the hardware cost of this embodiment is low.
Referring to fig. 5, in each of the sustain control circuits, one end of the inductor 131 is connected to the input capacitor CSYSThe OR gate backflow prevention device 12 is connected to the power end 111 of the power supply 11, and the electronic switch 132 is connected to the series node n of the inductor 131 and the OR gate backflow prevention device 12 and the power supplyBetween the ground terminals 112 of the reactor 11. For example, the or gate anti-reflux element 12 can be a diode or a body diode (body diode) of a transistor, the anode terminal of which is connected to the power source terminal 111, and the cathode terminal of which is connected to the inductor 132. The electronic switch 132 can be a diode or a body diode (body diode) of a transistor, and a cathode terminal and an anode terminal thereof are respectively connected to the series node n and the ground terminal 112. Therefore, the output capacitor CDCThe or gate reverse-flow preventing element 12, the inductor 132, the electronic switch 132 and the controller (not shown) may form a buck circuit (buckcoverter) after the ac power is cut off, and the operation principle of the buck circuit is well known and will not be described in detail herein.
In each of the sustaining control circuits, each of the sustaining control circuits may further comprise a bypass switch, which is exemplified by fig. 6, but not limited to the embodiment shown in fig. 6, wherein the bypass switch 14 is connected between the power terminal 111 of each of the power supplies 11 and the input capacitor C of the load system LSYSThe bypass switch 14 is connected in parallel with the or gate reverse-flow preventing element 12 and the inductor 131 connected in series; the controller (not shown) is connected to a control terminal of the bypass switch 14. For example, the bypass switch 14 may be a transistor having a first terminal, a second terminal and a control terminal, wherein the first terminal and the second terminal may be a Drain terminal (Drain) or a Source terminal (Source), respectively, and the control terminal may be a Gate terminal (Gate).
When the controller determines that the power supply 11 can output the DC power VDCWhen the controller is in the open state, the controller turns on the bypass switch 14 and controls the electronic switch 132 to allow the dc power output by the power supply 11 to directly reach the load system L through the bypass switch 14, and no loss is caused because the dc power does not pass through the or gate anti-reflux element 12 and the inductor 131; on the contrary, when the controller determines that the power supply 11 does not output the dc power, the controller controls the bypass switch 14 to be in the open state, and intermittently turns on the electronic switch 132 to implement the voltage-reducing circuit, so as to prolong the holding time.
In summary, the present invention is based on the circuit architecture of a typical redundant power supply system, please refer to fig. 2 to fig. 6, each power supply 11 is connected to a sustain control circuit 13, the sustain control circuit 13 provides the function of prolonging the sustain time, and the sustain control circuit 13 only includes electronic components such as a controller, an inductor, a diode or a transistor, compared with a capacitor with large capacity, the cost of the sustain control circuit 13 of the present invention is lower, the volume is smaller, and the inconvenience of the whole mechanism design of the system is not caused, so the whole system of the present invention can balance the setup cost and the obtained efficacy.
The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

1. A redundant power supply system for extending a retention time after power down for connection to an input capacitor of a load system, the redundant power supply system comprising:
a plurality of power supplies connected in parallel to each other for connecting the input capacitor, at least one or gate reverse-flow preventing element being connected between a dc output side of each power supply and the input capacitor, and the dc output side having an output capacitor, each power supply comprising:
an AC/DC power conversion circuit having an AC input side for receiving an AC power from a commercial power;
a power factor correction circuit;
a DC/DC power conversion circuit having the DC output side;
the AC/DC power supply conversion circuit, the power factor correction circuit and the DC/DC power supply conversion circuit cooperate to perform DC conversion and power factor correction on the AC power supply so as to output a DC power supply at the DC output side;
a plurality of sustain control circuits respectively connected between the dc output sides of the plurality of power supplies and the load system, each sustain control circuit comprising:
at least one inductor connected in series with the at least one OR gate anti-reflux element;
at least one electronic switch connected between the series node of the inductor and the OR gate anti-reflux element and the DC output side of each power supply; and
the controller is connected with the direct current output side of each power supply and a control end of the at least one electronic switch to judge whether the direct current power output by the direct current output side is lower than a lower limit value or not so as to control the at least one electronic switch to be conducted or not; when the controller judges that the direct current power supply is not lower than the lower limit value, the controller controls the electronic switch to be in an open circuit state; when the controller judges that the direct current power supply is lower than the lower limit value, the controller controls the electronic switch to be in an intermittent conduction state.
2. The redundant power supply system according to claim 1, wherein the at least one or-gating reverse-flow prevention element connected between the dc output side of each of the power supplies and the input capacitor is a single or-gating reverse-flow prevention element;
in each of the sustain control circuits, the at least one inductor is a single inductor and the at least one electronic switch is a single electronic switch.
3. The redundant power supply system according to claim 1, wherein the at least one or-gating reverse-flow prevention element connected between the dc output side of each of the power supplies and the input capacitor comprises a plurality of or-gating reverse-flow prevention elements;
in each maintaining control circuit, the at least one inductor comprises a plurality of inductors which are respectively connected in series with the plurality of OR gate anti-reflux elements; the at least one electronic switch comprises a plurality of electronic switches which are respectively connected between the serial nodes of the inductors and the OR gate backflow prevention elements and the direct current output side of each power supply.
4. The system of any one of claims 1 to 3, wherein each of the power supplies has a power supply terminal and a ground terminal on a DC output side thereof, and the output capacitor is connected between the power supply terminal and the ground terminal;
in each of the sustain control circuits, one end of the inductor is connected to the power supply terminal, the or gate backflow prevention element is connected to the input capacitor, and the electronic switch is connected between the ground terminal and a serial node of the inductor and the or gate backflow prevention element, so that the output capacitor, the or gate backflow prevention element, the inductor, the electronic switch and the controller form a boost circuit.
5. The system of any one of claims 1 to 3, wherein each of the power supplies has a power supply terminal and a ground terminal on a DC output side thereof, and the output capacitor is connected between the power supply terminal and the ground terminal;
in each of the sustain control circuits, one end of the inductor is connected to the input capacitor, the or gate reverse-flow prevention element is connected to the power supply end, and the electronic switch is connected between the ground end and a serial node of the inductor and the or gate reverse-flow prevention element, so that the output capacitor, the or gate reverse-flow prevention element, the inductor, the electronic switch and the controller form a voltage reduction circuit.
6. The system of claim 4, wherein the OR gate anti-backflow device is a diode, an anode terminal of the diode is connected to the inductor, and a cathode terminal of the diode is connected to the input capacitor.
7. The system of claim 4, wherein the OR gate anti-backflow device is a transistor device, a control terminal of the transistor device is connected to the controller, the transistor device has a body diode, an anode terminal of the body diode is connected to the inductor, and a cathode terminal of the body diode is connected to the input capacitor.
8. The system of claim 5, further comprising a bypass switch connected between a power terminal of each of the power supplies and the input capacitor, wherein the bypass switch is connected in parallel with the series-connected OR gate anti-reflux element and the inductor; the controller is connected with a control end of the bypass switch.
9. The system of claim 5, wherein the OR gate anti-backflow device is a diode, an anode terminal of the diode is connected to the power source terminal, and a cathode terminal of the diode is connected to the inductor.
10. The system of claim 5, wherein the OR gate anti-backflow device is a transistor device, a control terminal of the transistor device is connected to the controller, the transistor device has a body diode, an anode terminal of the body diode is connected to the power source terminal, and a cathode terminal of the body diode is connected to the inductor.
CN201710538784.7A 2017-07-04 2017-07-04 Redundant power supply system capable of prolonging maintenance time after power failure Active CN109217450B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710538784.7A CN109217450B (en) 2017-07-04 2017-07-04 Redundant power supply system capable of prolonging maintenance time after power failure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710538784.7A CN109217450B (en) 2017-07-04 2017-07-04 Redundant power supply system capable of prolonging maintenance time after power failure

Publications (2)

Publication Number Publication Date
CN109217450A CN109217450A (en) 2019-01-15
CN109217450B true CN109217450B (en) 2020-11-03

Family

ID=64993754

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710538784.7A Active CN109217450B (en) 2017-07-04 2017-07-04 Redundant power supply system capable of prolonging maintenance time after power failure

Country Status (1)

Country Link
CN (1) CN109217450B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109917892A (en) * 2019-03-06 2019-06-21 苏州浪潮智能科技有限公司 A kind of server system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201075737Y (en) * 2007-07-20 2008-06-18 忆正存储技术(深圳)有限公司 Power down protection circuit
CN101232201A (en) * 2006-11-10 2008-07-30 得逻辑公司 Supercapacitor backup power supply with bi-directional powerflow
CN201369577Y (en) * 2008-12-18 2009-12-23 成都市华为赛门铁克科技有限公司 Power failure protective device and electronic equipment realized thereby
CN202276184U (en) * 2011-09-23 2012-06-13 沈阳设维士重型机械有限公司 Large-scale charge and discharge combination chopper constant voltage ongoing direct-current power supply device
CN204810144U (en) * 2015-05-15 2015-11-25 光宝电子(广州)有限公司 Electric output holding circuit is fallen in input

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7915866B2 (en) * 2006-11-13 2011-03-29 Psion Teklogix Inc. Supercapacitor backup power supply with bi-directional power flow

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101232201A (en) * 2006-11-10 2008-07-30 得逻辑公司 Supercapacitor backup power supply with bi-directional powerflow
CN201075737Y (en) * 2007-07-20 2008-06-18 忆正存储技术(深圳)有限公司 Power down protection circuit
CN201369577Y (en) * 2008-12-18 2009-12-23 成都市华为赛门铁克科技有限公司 Power failure protective device and electronic equipment realized thereby
CN202276184U (en) * 2011-09-23 2012-06-13 沈阳设维士重型机械有限公司 Large-scale charge and discharge combination chopper constant voltage ongoing direct-current power supply device
CN204810144U (en) * 2015-05-15 2015-11-25 光宝电子(广州)有限公司 Electric output holding circuit is fallen in input

Also Published As

Publication number Publication date
CN109217450A (en) 2019-01-15

Similar Documents

Publication Publication Date Title
US10804734B2 (en) Redundant power supply system that prolongs the holdup time after a power failure
TWI493834B (en) A power supply system and its power supply unit and method
US9024609B2 (en) Circuit and method for providing hold-up time in a DC-DC converter
US9698677B2 (en) Brownout recovery circuit for bootstrap capacitor and switch power supply circuit
US8339110B2 (en) Single stage hybrid charge pump
US9876423B2 (en) DC-to-DC converter
US8767357B2 (en) Overvoltage protection system for power system with multiple parallel-connected switching power supplies
JPWO2006090674A1 (en) Power converter
US20080036526A1 (en) Control circuit for multi-phase converter
JP2007166783A (en) Power transforming apparatus
JP2009159746A (en) Power supply switching circuit
US20190260226A1 (en) Power supply and power supplying method with power backup
US8525503B2 (en) Hybrid rectifier
CN109217450B (en) Redundant power supply system capable of prolonging maintenance time after power failure
US9653989B2 (en) Suppying an output voltage using unsynchronized direct current to direct current converters
TWI638501B (en) Redundant power supply system that extends the hold time after power failure
EP3301524B1 (en) Programmable logic controller
JP2001069747A5 (en)
CN115514220A (en) Buck-boost converter and power supply system
JP2019068526A (en) Converter system
US9960636B2 (en) Power supply system and direct-current converter thereof
US9335774B1 (en) Non-isolated intermediate bus converter
CN109217655B (en) Power supply capable of prolonging maintenance time after power failure
TW201729525A (en) Switching regulator
CN113659819A (en) Power-down delay control method and control circuit

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant